Malicious PDF — malware analysis report

Static analysis result for SHA-256 e92539c798506313…

MALICIOUS

PDF

75.1 KB Created: 2021-04-01 09:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a445e4b0688977a37c40c4c7dfd66b84 SHA-1: 2549071ace7b49c6bc974a3289e00ca3a5b01a03 SHA-256: e92539c798506313e68a177d8a40ab8b21504868848530050c71c67cc08a5a61
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains the phrase 'Define radical honesty', which appears to be a lure to direct users to the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mezovuduw.ru/strik?utm_term=define+radical+honesty PDF link annotation
    • https://cdn.sqhk.co/fanabezom/RiaIicD/dofuvupolakez.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/icKieid/45829321376.pdfIn PDF document text
    • https://cdn.sqhk.co/badaxiloru/ficaZDn/airtel_prepaid_sim_recharge_offers.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/jggtvY8/horror_film_movie_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421780/normal_6041471bee1d4.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwozavenu/KPjebje/wawetafowoxowiteta.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414169/normal_6062b6a7a0962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478670/normal_603ea97ed5e02.pdfIn PDF document text
    • http://tuzevijubozor.mywebcommunity.org/26500957444.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/rVrTggG/tetris_effect_steam_unlocked.pdfIn PDF document text
    • https://cdn.sqhk.co/fagiseregu/gh6jgMw/limupi.pdfIn PDF document text
    • https://cdn.sqhk.co/jasekazus/g0NDEib/11293813312.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/8vtha44/tiny_farmer_family_building_tycoon_farming_simulator.pdfIn PDF document text
    • https://cdn.sqhk.co/satidaruxami/RigcCll/shopdisney_uk_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/jetirivotu/dqu77J8/scent_of_a_woman_tango.pdfIn PDF document text
    • https://cdn.sqhk.co/zomuzuta/hideicW/allen_test_papers_2018_jee_mains.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6039262e53829.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_0593b72278714ea58894f3607b008b87.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_5b2fde7e44194a56aba30defe4a96b68.pdf?index=trueIn PDF document text
    • http://woranuganavot.myartsonline.com/319931155.pdfIn PDF document text
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_dead6696ae294a05812dfa371c52119c.pdf?index=trueIn PDF document text
    • http://binuwuzipu.myartsonline.com/3rd_grade_math_addition_word_problems.pdfIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_72134da597e541d6b75ebe48c44259ad.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F8 5208 bytes
SHA-256: 1ef5ab9c6cd52d51d6ef268f411280c56e8505376ba40cf49670368380ca36d0
font_01_sfnt_off0000fab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB7 10744 bytes
SHA-256: dfaa56b6f0071b3dda1a0d894f28c03d7c3559a6b7754490171cbe2e6570001d